Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered. The description adds the endpoint call to /trains/getRoute and specifies the input is a known train number, but it does not disclose additional behavioral details such as pagination, availability windows, or partial route responses.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.